画线功能java代码 java画线段
java简单的画线程序
import java.awt.*;
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import java.awt.event.*;
import java.util.ArrayList;public class DrawLine extends Frame
implements WindowListener
{
static ArrayList lbArray; DrawLine(){
setBounds(150,150,300,300);
setVisible(true);
Label lb0=new Label("Hello");
addWindowListener(this);
add(lb0);
lb0.setBounds(50,30,40,20);
Label lb1=new Label("World!");
add(lb1);
lb1.setBounds(50,90,40,20); Label lb2=new Label("Java");
add(lb2);
lb2.setBounds(50,150,40,20);
lbArray.add(lb0);
lbArray.add(lb1);
lbArray.add(lb2);
repaint(); }
public void windowClosed(WindowEvent w)
{
System.exit(0);
}
public void windowClosing(WindowEvent w)
{
dispose();
}
public void windowOpened(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
public void paint(Graphics g)
{
super.paint(g); if(lbArray.size()=1)
{
g.setColor(Color.red);
int x1,y1,x2,y2;
Label lb=(Label)lbArray.get(0);
Rectangle rc=lb.getBounds();
x1=rc.x+rc.width/2;
y1=rc.y+rc.height/2;
for(int i=1;ilbArray.size();i++)
{
lb=(Label)lbArray.get(i);
rc=lb.getBounds();
x2=rc.x+rc.width/2;
y2=rc.y+rc.height/2;
g.drawLine(x1,y1,x2,y2);
x1=x2;
y1=y2;
}
}
} public static void main(String[] args){
lbArray=new ArrayList(10);
new DrawLine();
}
} 终于做了个满足你要求的东西。要知道我昨天和你说过我并不常用Java。赶快采纳吧。
java 最简单的画线演示程序
对于你拖动的时候会描出很多线的问题,可以在public void paint(Graphics g)函数中,用super.paint(g);语句解决,就象下面我的程序一样。
最简单的画线演示程序如下:
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class DrawLine extends JFrame implements MouseListener,MouseMotionListener{
private int x0=0,y0=0,x=0,y=0;
JPanel jp=new JPanel();
DrawLine(){
jp.addMouseListener(this);
jp.addMouseMotionListener(this);
add(jp);
setSize(300, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public void paint(Graphics g){
super.paint(g);
g.drawLine(x0, y0, x, y);
}
public static void main(String[] args) {
new DrawLine();
}
public void mouseDragged(MouseEvent arg0) {
x=arg0.getXOnScreen();
y=arg0.getYOnScreen();
repaint();
}
public void mouseMoved(MouseEvent arg0) {}
public void mouseClicked(MouseEvent arg0) {}
public void mouseEntered(MouseEvent arg0) {}
public void mouseExited(MouseEvent arg0) {}
public void mousePressed(MouseEvent arg0) {
x0=arg0.getXOnScreen();
y0=arg0.getYOnScreen();
}
public void mouseReleased(MouseEvent arg0) {
x=arg0.getXOnScreen();
y=arg0.getYOnScreen();
repaint();
}
}
java简单画线程序
这个覆盖 paint 方法就可以了。
我帮你写好了,我采用的方法是:把内容画在一个 JPanel 里,然后用 setContentPane 添加到了 JFrame 上,这样做是因为定位问题:JFrame 有边框,绘制组件的时候坐标是算边框占位的,但是 drawLine 的时候是不算的,为了统一算边框,就用了这个办法。
下面是两个文件,第一个 MyFrame 是一个完整的工具,MyFrame 因为继承了 JFrame,用起来和 JFrame 一样用,另外提供了一个接口,addComponent(JComponent) 方法可以向里添加组件,会自动连线的。你只要 import ui 就可以用了。
然后第二个是测试类,可以看到我在 setVisible 之后添加的组件,它也能正确显示,证明 addComponent 方法可以随时调用,不用另外刷新。
---------------------------- MyFrame.java -----------------------------
package ui;
import java.awt.*;
import javax.swing.*;
import java.util.*;
class MyPanel extends JPanel {
private VectorJComponent comps;
public MyPanel () {
comps = new VectorJComponent();
setLayout(null);
}
public void paint (Graphics g) {
g.setColor(Color.BLACK);
for (int i=1; icomps.size(); i++) {
g.drawLine(comps.get(0).getLocation().x+comps.get(0).getSize().width/2,
comps.get(0).getLocation().y+comps.get(0).getSize().height/2,
comps.get(i).getLocation().x+comps.get(i).getSize().width/2,
comps.get(i).getLocation().y+comps.get(i).getSize().height/2);
}
super.paintComponents(g);
}
public void addComponent (JComponent comp) {
comp.setOpaque(true);
comps.add(comp);
add(comp);
repaint();
}
}
public class MyFrame extends JFrame {
private MyPanel mp;
public MyFrame () {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mp = new MyPanel();
setContentPane(mp);
}
public void addComponent (JComponent comp) {
mp.addComponent(comp);
}
}
---------------------------- TestMyFrame.java -----------------------------
import ui.*;
import javax.swing.*;
import javax.swing.border.*;
public class TestMyFrame {
public static void main (String args[]) {
MyFrame mf = new MyFrame();
mf.setSize(500, 500);
mf.setLocationRelativeTo(null);
mf.setVisible(true);
testAddComponent(mf);
}
public static void testAddComponent (MyFrame mf) {
JLabel l1 = new JLabel("l1");
l1.setBorder(new EtchedBorder());
l1.setBounds(200, 100, 20, 20);
mf.addComponent(l1);
JLabel l2 = new JLabel("l2");
l2.setBounds(100, 150, 20, 20);
l2.setBorder(new EtchedBorder());
mf.addComponent(l2);
JLabel l3 = new JLabel("l3");
l3.setBounds(150, 150, 20, 20);
l3.setBorder(new EtchedBorder());
mf.addComponent(l3);
JLabel l4 = new JLabel("l4");
l4.setBounds(200, 150, 20, 20);
l4.setBorder(new EtchedBorder());
mf.addComponent(l4);
}
}
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